4 ms·
Graph says pretty clearly the patch is 60-70% slower! or 2.5-3x hardware costs. I wonder which CPU family this is?
by herf 9y ago
Graph says pretty clearly the patch is 60-70% slower! or 2.5-3x hardware costs. I wonder which CPU family this is?
- jug 9y agoThis surprised me a lot. I thought 30-50% would be worst case and then with additive effects from both Spectre and Meltdown fixes. Not sure how it can be this bad. I imagine it could get even worse if you are running in a virtualized environment on top where the server is affected in turn, but I figure thst wouldn’t show in a CPU graph like this..
- Tuna-Fish 9y agoThe kernel address space isolation makes syscalls much more expensive than they were. A toy program that just repeatedly calls the cheapest syscall in the kernel would lose much more than half it's speed, but that's not what's reported because no-one actually needs to run that workload. Epic seems to have been particularly unlucky in how KPTI impacts them.